Oops, it doesn't look like 'lyss day' is a national day..

Other days

boba

Boba Day
self care

Self Care Day
blanket fort

Blanket Fort Day
girl friend

Girl Friend Day
offer

Offer Day
slime

Slime Day
cuddle up

Cuddle Up Day
lost sock memorial

Lost Sock Memorial Day
china

China Day
hannah

Hannah Day